Glad to see the Canon 7D continuing to get some hack love! Clean HDMI being the newest of them. Check out the video demonstrating what could be coming to a 7D near you.
From the video description:
This is a test video where i filmed my Samsung LCD showing Canon EOS 7D HDMI output while recording.
Test subject is the “Clear overlays” feature, that disables all paintings on HDMI output.